<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/小花和姜饼.jpg" alt="" />
      </div>

      <!-- 登录表单区 -->
      <el-form
        ref="loginformref"
        :model="loginform"
        class="login_form"
        :rules="loginformrules"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            v-model="loginform.username"
          ></el-input>
        </el-form-item>

        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="el-icon-lock"
            v-model="loginform.password"
            type="password"
          ></el-input>
        </el-form-item>

        <!-- 按钮区域 -->
        <el-form-item class="btns"
          ><el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetloginform">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      loginform: {
        username: "admin",
        password: "123456",
      },
      //这是表单的验证对象
      loginformrules: {
        //验证用户名是否合法
        username: [
          { required: true, message: "请输入登录账号", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        //验证密码是否合法
        password: [
          { required: true, message: "请输入登录密码", trigger: "blur" },
          {
            min: 6,
            max: 16,
            message: "长度在 6 到 16 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    resetloginform() {
      this.$refs.loginformref.resetFields();
    },
    sayhi() {
      console.log("hi");
    },
    login() {
      this.$refs.loginformref.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post("login", this.loginform);
        if (res.meta.status !== 200)
          return this.$message.error("账号或密码错误，登录失败！");
        this.$message.success("登录成功！");
        //token是登录的凭证，保存在sssionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        //通过编程式导航跳转到后台页面 路由地址是/home
        this.$router.push("/home");
      });
    },
  },
  created() {
    var t = this;
    document.onkeydown = function (e) {
      if (window.event == undefined) {
        var key = e.keyCode;
      } else {
        var key = window.event.keyCode;
      }
      //enter的ASCII码是13
      if (key == 13) {
        t.login(); //t.登录方法
      }
    };
  },
};
</script>

<style lang="less" scoped>
.login_container {
  background: url(../assets/jiangnan.jpg);
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 15px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    margin: -65px auto 0 auto;
    // background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.btns {
  display: flex;
  justify-content: right;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>